生物谷Bioon.com 訊 8月12日，英約克大學(xué)和愛(ài)丁堡大學(xué)研究人員報(bào)告說(shuō),，研究表明植物研究的模式植物——擬南芥在如果缺失一種基因,，它會(huì)更好地生長(zhǎng)。這一發(fā)現(xiàn)為延長(zhǎng)農(nóng)作物春秋兩季的生長(zhǎng)時(shí)間提供了新思路,。成果發(fā)表與Current Biology雜志上。
他們共同發(fā)現(xiàn)一種代號(hào)為SPT的基因與擬南芥低溫生長(zhǎng)有關(guān),。實(shí)驗(yàn)顯示,，在低溫環(huán)境下，沒(méi)有這個(gè)基因的擬南芥植株,，不但抗寒能力不會(huì)下降,，而且比有SPT基因的擬南芥植株長(zhǎng)勢(shì)更好,。
擬南芥是農(nóng)作物培育研究方面的一種模式植物，它的很多基因與農(nóng)作物的基因具有同源性,。
研究人員史蒂夫·彭菲爾德說(shuō),，這一發(fā)現(xiàn)對(duì)于某些農(nóng)作物增產(chǎn)具有重要意義,，如果能借助基因手段培育出在低溫下長(zhǎng)勢(shì)更好的農(nóng)作物,，就能使農(nóng)作物在春秋兩季的有效生長(zhǎng)時(shí)間得以延長(zhǎng)并實(shí)現(xiàn)增產(chǎn),。（生物谷Bioon.com）
Plant Science：水稻抗寒基因Ctb1的圖位克隆
The Plant Cell ：基因調(diào)控?cái)M南芥開(kāi)花時(shí)間
關(guān)于擬南芥中某基因半定量RT的討論
孟山都在中國(guó)轉(zhuǎn)基因作物戰(zhàn)斗的思考
生物谷推薦原文出處：
Current Biology doi:10.1016/j.cub.2010.07.028
SPATULA Links Daytime Temperature and Plant Growth Rate
Kate Sidaway-Lee1, Eve-Marie Josse2, Alanna Brown1, Yinbo Gan1, 3, Karen J. Halliday2, Ian A. Graham1 and Steven Penfield 1
1 Department of Biology, University of York, P.O. Box 373, York YO10 5YW, UK
2 Institute of Molecular Plant Sciences, School of Biological Sciences, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JH, UK
Plants exhibit a wide variety of growth rates that are known to be determined by genetic and environmental factors, and different plants grow optimally at different temperatures [[1] and [2]], indicating that this is a genetically determined character. Moderate decreases in ambient temperature inhibit vegetative growth, but the mechanism is poorly understood, although a decrease in gibberellin (GA) levels is known to be required [3]. Here we demonstrate that the basic helix-loop-helix transcription factor SPATULA (SPT), previously known to be a regulator of low temperature-responsive germination [4], mediates the repression of growth by cool daytime temperatures but has little or no growth-regulating role under warmer conditions. We show that only daytime temperatures affect vegetative growth and that SPT couples morning temperature to growth rate. In seedlings, warm temperatures inhibit the accumulation of the SPT protein, and SPT autoregulates its own transcript abundance in conjunction with diurnal effects. Genetic data show that repression of growth by SPT is independent of GA signaling and phytochrome B, as previously shown for PIF4 [5]. Our data suggest that SPT integrates time of day and temperature signaling to control vegetative growth rate.
